21544344344513 has 8 divisors (see below), whose sum is σ = 22240224034560. Its totient is φ = 20848520957040.

The previous prime is 21544344344473. The next prime is 21544344344557. The reversal of 21544344344513 is 31544344344512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21544344344513 - 2²⁴ = 21544327567297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21544344346513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13297295 + ... + 14829252.

It is an arithmetic number, because the mean of its divisors is an integer number (2780028004320).

Almost surely, 2^{21544344344513} is an apocalyptic number.

It is an amenable number.

21544344344513 is a deficient number, since it is larger than the sum of its proper divisors (695879690047).

21544344344513 is a wasteful number, since it uses less digits than its factorization.

21544344344513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28151287.

The product of its digits is 5529600, while the sum is 47.

Subtracting 21544344344513 from its reverse (31544344344512), we obtain a palindrome (9999999999999).

The spelling of 21544344344513 in words is "twenty-one trillion, five hundred forty-four billion, three hundred forty-four million, three hundred forty-four thousand, five hundred thirteen".